Weird, uncomfortable, sharp pains when i stand up and walk around.

I'm 12wks + 4 days pregnant with my first and just in the last 15mins i stood up and walked a bit and I keep getting this horrible pain down below near my vagina area, and same again when i stood up and walked again. I've never felt anything like it before.
I've had no bleeding during my pregnancy at all and I don't have any cramping, it just hurts when i walk. What is it? should I be worried? I have to go to work later and what if it hurts when I walk?

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